Well....that, and the therapy of actually pulling them from the dustbin and making them usefull again. I really get off on that, and selling them is just a plus. Besides, it's cheaper than a shrink.......
I used to buy all my friends used bikes when they got new ones. Schwinn Sting Rays, that sort of thing. I'd clean, wax, polish and grease. I'd steel wool the cheap zinc spokes and make them shine too. Then into the Pennysaver and out the door for a $15-20 profit. Not bad money for a kid in the late sixties!
My garage is overflowing with stuff now, so I know I gotta start selling something soon.